Tachometer.



A. ALLEMANN.

TAGHOMETEB.

APPLICATION FILED JUNE 10, 1913.

Patented Dec. 9, 1913.

3 SHEETS-SHEET 1.

COLUMBIA PLANOGRAPH cc.,wAsl-||NGTON. D. c.

A. ALLEMANN.

Patented Dec. 9,1913.

3 SHEETS-SHEET 2.

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UNITED STATES PATENT OFFICE.

ARNOLD ALLEMANN, OF BERNE, SWITZERLAND, ASSIGNOB T0 FIRMA SCHWEIZ.

KOMMISSIONS- UNI) AUFBEWAHRUNGS-HAUS FUR DAS IN- UND AUSLAND T0- MASCHPOLSKY & WEIDENFELD, OF BERNE, SVVITZER-LANID, A CORPORATION OF SWITZERLAND.

To all whom it may concern:

Be it known that I, ARNOLD ALLEMANN, a citizen of the Swiss Confederation, and residing at Berne, Switzerland, have invented certain new and useful Improvements in Tachometers, of which the following is a specification.

Mly invention relates to a known type of tachometer, and a primary object is to provide an improved tachometer in which not only the toothed racks, as in the known tachometer, but also the slides are displaceably guided in rocking levers. On the one side of these levers is arranged the pinion driving the racks, and on the opposite side of the levers are arranged locking members for engaging in toothing of the slides.

One illustrative embodiment of my invention is represented by way of example in the accompanying drawings, where1n:

Figure 1 is a vertical section taken on the line II in Fig. 3, showing a preferred form of my improved tachometer. Fig. 2 is a front elevation thereof after the removal of the pointer, scale and plate, and Fig. 3 is a side elevation thereof.

Referring to the drawing, my improved tachometer is a simplified form of the type known heretofore inasmuch as in the same, as already mentioned, the slides 30 and 32 are guided by rocking levers 7 and 8, so that separate guides for the slides are dispensed with. Each of the toothed racks 14 constantly pulled downward by a spring 20 is mounted longitudinally displaceably in a one-armed lever 7 and 8, respectively, rocking about the pivot 9 and carries at its lower end a stop 19 which projects into the path of a slide 30 and 32, respectively, guided to move longitudinally on the other side of the corresponding lever. A spring-pressed pawl 10 can engage in the toothing of each slide. Within reach of the upper ends of the two slides 30 and 32 is a projection 39; this projection is provided on a slide 34 guided vertically in a guide 29 on the front of the plate 1 and can move in a vertical slot in this plate. The slide 34 is connected by the Specification of Letters Patent.

Application filed June 10, 1913.

TACI-IOMETER.

Patented Dec. 9, 1913.

Serial No. 772,744.

toothed wheels 36, 12 with the axle 38 of the pointer and is drawn downward by the spring 37.

In the position of the parts shown in Fig. 2 the lever 7 is rocked to the left by the cam 5 and the corresponding rack 1-1 is thereby brought into engagement with the pinion 21. while on the other hand the slide 30 guided by the lever 7 is moved out of reach of the appertaining pawl 10 and consequently bears on the stop 19 of the rack 14. The slide 32 of the lever 8, however, is locked by the appertaining pawl 10 in its elevated position and abuts against the projection 39 of the slide 34, whereby the pointer 44 indicates a predetermined speed above zero. The rack 1d appertaining to the lever 8 is moved away from the pinion 21 and held by the spring 20 in its lowest position. The other rack 14 is lifted by the pinion 21 and by means of the stop 19 drives the slide 30 until the moment when the cam 5 leaves the lever 7 to the influence of the spring 16, the rack 1 1 being disengaged and the slide 30 locked, whereas the lever 8 is simultaneously rocked to the left by the cam 6 whereby the slide 32 is released and moves under the action of gravity into its lowest position in order to be lifted afresh from this position by the rack 14 which now correspondingly meshes with the pinion 21.

I claim In a tachometer, the combination with two rocking levers, a toothed rack mounted to move longitudinally on each lever, and a pinion for driving said racks when the levers are rocked into one end position, of a toothed slide mounted to move longitudinally on each lever, locking means for arresting the slides when the levers are rocked into the other end position, and indicating means controlled by said slides.

In testimony whereof, I affix my signature in the presence of two witnesses.

ARNOLD ALLEMANN.

Witnesses:

FRIEDRICH NAEGELI, FRIEDRICH MONING.

copies of thin patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

